linux-kernel - Re: [v3 24/26] KVM: Update Posted-Interrupts Descriptor when vCPU is blocked

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Message-ID: <20150225215011.GA16848@amt.cnet>
Date:	Wed, 25 Feb 2015 18:50:11 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Feng Wu <feng.wu@...el.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...nel.org, pbonzini@...hat.com,
	dwmw2@...radead.org, joro@...tes.org, alex.williamson@...hat.com,
	jiang.liu@...ux.intel.com, eric.auger@...aro.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	kvm@...r.kernel.org
Subject: Re: [v3 24/26] KVM: Update Posted-Interrupts Descriptor when vCPU is
 blocked

On Fri, Dec 12, 2014 at 11:14:58PM +0800, Feng Wu wrote:
> This patch updates the Posted-Interrupts Descriptor when vCPU
> is blocked.
> 
> pre-block:
> - Add the vCPU to the blocked per-CPU list
> - Clear 'SN'
> - Set 'NV' to POSTED_INTR_WAKEUP_VECTOR
> 
> post-block:
> - Remove the vCPU from the per-CPU list
> 
> Signed-off-by: Feng Wu <feng.wu@...el.com>
> ---

Don't see this is needed, can use the existing POSTED_INTR_VECTOR:

If in guest mode, IPI will be handled in VMX non-root by performed
PIR->IRR transfer.

If outside guest mode, POSTED_INTR_VECTOR IPI will be handled by host
which can wakeup the guest (in case it is halted).
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